Material displacement looks slanted to one side in Blender 2.8
In Blender 2.80 the Material's Displacement input socket accepts vectors (blue socket) instead of scalars (grey socket), which gives it more possibilities (look up "vector displacement"). 

To properly convert a scalar Displacement map, usually a greyscale image, and make it pluggable into the material's Displacement, you need to use a Displacement node:



The Displacement node has a "Scale" value so that you don't need to use a Math > Multiply node.